This one of those fine balancing acts on board. I was on the 333 yesterday. 265 individuals have 265 body thermostats. Some like it hot, some like it cold. Generally (just an observation) male passengers are too warm, female passengers are too cold. Personally I try to keep the cabin a bit cooler and have no personal agenda to induce anybody to sleep. I'm always 10 degrees too warm wherever I am, and could comfortably sleep in meat freezer.